What are two factors that affect an objects kinetic energy

Which of the following reactions have a positive ΔSrxn? Check all that apply. 2A (g) + B (s) - -> 3C (g) 2A (g) + B (g) - -> C (g) A (g) + B (g) - ->C (g) 2A (g) + 2B (g) - ->5C (g)

You have just explored the scientific method. Now test your understanding. Which of the following best describes a manipulated variable? A. It is the variable in a controlled experiment that is changed in the course of the experiment. B.

A general term for an attractive force that holds two atoms together is known as an

A sample of dihydrogen dioxide (hydrogen peroxide) has a mass of 456.78 grams. How many molecules are there in the sample? How many atoms are there?

Which of the following would not have the same number of valence electrons as the others? boron aluminum gallium selenium

A 75.00 g a sample of a substance is analyzed and found to consist of 32.73 g phosphorus and 42.7 g oxygen. calculate the percent composition of this substance.

Which one of the following melts the fastest: rectangular prism, cylinder, and rectangular trapezoidal trough?

A 1.8-mL volume of seawater contains about 4.0 * 10^-10 g of gold. The total volume of ocean water is about 1.5 * 10^21 L. Calculate the total worth of all the gold in the world's oceans if the price of gold is $19.

Why are numbers placed before the elements and molecules in a chemical equation?

Which of these pairs of elements have the same number of valence electrons? oxygen (O) and bromine (Br) selenium (Se) and bromine (Br) carbon (C) and lead (Pb) oxygen (O) and carbon (C) sodium (Na) and magnesium (Mg)